This second edition has been brought up to date, and minor errors have been corrected. The author handles the subject in such a way that he makes rather complex subjects easy to understand. Every medical school and hospital library should have a copy of this book. It can be recommended to all interns and residents dealing with patients in whom fluid or electrolyte problems exist. Even though other textbooks are available, the ease with which one can read this one gives it unusual value. The author is to be congratulated, primarily, because of the excellent organization, simplicity, and neatness with which the subject matter is handled. This book is divided into two parts, the first dealing with the basic principles of fluid movement and the second with the application of the basic principles to special problems. It is neatly and adequately illustrated. The paper, type, and general organization are excellent.